include/net/ip6_fib.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _IP6_FIB_H
  14 #define _IP6_FIB_H
  15
  16 #include <linux/ipv6_route.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/spinlock.h>
  19 #include <net/dst.h>
  20 #include <net/flow.h>
  21 #include <net/netlink.h>
  22 #include <net/inetpeer.h>
  23
  24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
  25 #define FIB6_TABLE_HASHSZ 256
  26 #else
  27 #define FIB6_TABLE_HASHSZ 1
  28 #endif
  29
  30 struct rt6_info;
  31
  32 struct fib6_config {
  33         u32             fc_table;
  34         u32             fc_metric;
  35         int             fc_dst_len;
  36         int             fc_src_len;
  37         int             fc_ifindex;
  38         u32             fc_flags;
  39         u32             fc_protocol;
  40         u32             fc_type;        /* only 8 bits are used */
  41
  42         struct in6_addr fc_dst;
  43         struct in6_addr fc_src;
  44         struct in6_addr fc_prefsrc;
  45         struct in6_addr fc_gateway;
  46
  47         unsigned long   fc_expires;
  48         struct nlattr   *fc_mx;
  49         int             fc_mx_len;
  50
  51         struct nl_info  fc_nlinfo;
  52 };
  53
  54 struct fib6_node {
  55         struct fib6_node        *parent;
  56         struct fib6_node        *left;
  57         struct fib6_node        *right;
  58 #ifdef CONFIG_IPV6_SUBTREES
  59         struct fib6_node        *subtree;
  60 #endif
  61         struct rt6_info         *leaf;
  62
  63         __u16                   fn_bit;         /* bit key */
  64         __u16                   fn_flags;
  65         __u32                   fn_sernum;
  66         struct rt6_info         *rr_ptr;
  67 };
  68
  69 #ifndef CONFIG_IPV6_SUBTREES
  70 #define FIB6_SUBTREE(fn)        NULL
  71 #else
  72 #define FIB6_SUBTREE(fn)        ((fn)->subtree)
  73 #endif
  74
  75 /*
  76  *      routing information
  77  *
  78  */
  79
  80 struct rt6key {
  81         struct in6_addr addr;
  82         int             plen;
  83 };
  84
  85 struct fib6_table;
  86
  87 struct rt6_info {
  88         struct dst_entry                dst;
  89
  90         struct neighbour                *n;
  91
  92         /*
  93          * Tail elements of dst_entry (__refcnt etc.)
  94          * and these elements (rarely used in hot path) are in
  95          * the same cache line.
  96          */
  97         struct fib6_table               *rt6i_table;
  98         struct fib6_node                *rt6i_node;
  99
 100         struct in6_addr                 rt6i_gateway;
 101
 102         atomic_t                        rt6i_ref;
 103
 104         /* These are in a separate cache line. */
 105         struct rt6key                   rt6i_dst ____cacheline_aligned_in_smp;
 106         u32                             rt6i_flags;
 107         struct rt6key                   rt6i_src;
 108         struct rt6key                   rt6i_prefsrc;
 109         u32                             rt6i_metric;
 110         u32                             rt6i_peer_genid;
 111
 112         struct inet6_dev                *rt6i_idev;
 113         unsigned long                   _rt6i_peer;
 114
 115 #ifdef CONFIG_XFRM
 116         u32                             rt6i_flow_cache_genid;
 117 #endif
 118         /* more non-fragment space at head required */
 119         unsigned short                  rt6i_nfheader_len;
 120
 121         u8                              rt6i_protocol;
 122 };
 123
 124 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
 125 {
 126         return inetpeer_ptr(rt->_rt6i_peer);
 127 }
 128
 129 static inline bool rt6_has_peer(struct rt6_info *rt)
 130 {
 131         return inetpeer_ptr_is_peer(rt->_rt6i_peer);
 132 }
 133
 134 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
 135 {
 136         __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
 137 }
 138
 139 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
 140 {
 141         return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
 142 }
 143
 144 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
 145 {
 146         inetpeer_init_ptr(&rt->_rt6i_peer, base);
 147 }
 148
 149 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
 150 {
 151         inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
 152 }
 153
 154 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 155 {
 156         return ((struct rt6_info *)dst)->rt6i_idev;
 157 }
 158
 159 static inline void rt6_clean_expires(struct rt6_info *rt)
 160 {
 161         if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
 162                 dst_release(rt->dst.from);
 163
 164         rt->rt6i_flags &= ~RTF_EXPIRES;
 165         rt->dst.from = NULL;
 166 }
 167
 168 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
 169 {
 170         if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
 171                 dst_release(rt->dst.from);
 172
 173         rt->rt6i_flags |= RTF_EXPIRES;
 174         rt->dst.expires = expires;
 175 }
 176
 177 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
 178 {
 179         if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 180                 if (rt->dst.from)
 181                         dst_release(rt->dst.from);
 182                 /* dst_set_expires relies on expires == 0
 183                  * if it has not been set previously.
 184                  */
 185                 rt->dst.expires = 0;
 186         }
 187
 188         dst_set_expires(&rt->dst, timeout);
 189         rt->rt6i_flags |= RTF_EXPIRES;
 190 }
 191
 192 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
 193 {
 194         struct dst_entry *new = (struct dst_entry *) from;
 195
 196         if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
 197                 if (new == rt->dst.from)
 198                         return;
 199                 dst_release(rt->dst.from);
 200         }
 201
 202         rt->rt6i_flags &= ~RTF_EXPIRES;
 203         rt->dst.from = new;
 204         dst_hold(new);
 205 }
 206
 207 struct fib6_walker_t {
 208         struct list_head lh;
 209         struct fib6_node *root, *node;
 210         struct rt6_info *leaf;
 211         unsigned char state;
 212         unsigned char prune;
 213         unsigned int skip;
 214         unsigned int count;
 215         int (*func)(struct fib6_walker_t *);
 216         void *args;
 217 };
 218
 219 struct rt6_statistics {
 220         __u32           fib_nodes;
 221         __u32           fib_route_nodes;
 222         __u32           fib_rt_alloc;           /* permanent routes     */
 223         __u32           fib_rt_entries;         /* rt entries in table  */
 224         __u32           fib_rt_cache;           /* cache routes         */
 225         __u32           fib_discarded_routes;
 226 };
 227
 228 #define RTN_TL_ROOT     0x0001
 229 #define RTN_ROOT        0x0002          /* tree root node               */
 230 #define RTN_RTINFO      0x0004          /* node with valid routing info */
 231
 232 /*
 233  *      priority levels (or metrics)
 234  *
 235  */
 236
 237
 238 struct fib6_table {
 239         struct hlist_node       tb6_hlist;
 240         u32                     tb6_id;
 241         rwlock_t                tb6_lock;
 242         struct fib6_node        tb6_root;
 243         struct inet_peer_base   tb6_peers;
 244 };
 245
 246 #define RT6_TABLE_UNSPEC        RT_TABLE_UNSPEC
 247 #define RT6_TABLE_MAIN          RT_TABLE_MAIN
 248 #define RT6_TABLE_DFLT          RT6_TABLE_MAIN
 249 #define RT6_TABLE_INFO          RT6_TABLE_MAIN
 250 #define RT6_TABLE_PREFIX        RT6_TABLE_MAIN
 251
 252 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 253 #define FIB6_TABLE_MIN          1
 254 #define FIB6_TABLE_MAX          RT_TABLE_MAX
 255 #define RT6_TABLE_LOCAL         RT_TABLE_LOCAL
 256 #else
 257 #define FIB6_TABLE_MIN          RT_TABLE_MAIN
 258 #define FIB6_TABLE_MAX          FIB6_TABLE_MIN
 259 #define RT6_TABLE_LOCAL         RT6_TABLE_MAIN
 260 #endif
 261
 262 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
 263                                          struct fib6_table *,
 264                                          struct flowi6 *, int);
 265
 266 /*
 267  *      exported functions
 268  */
 269
 270 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
 271 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
 272 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
 273                                                   struct flowi6 *fl6, int flags,
 274                                                   pol_lookup_t lookup);
 275
 276 extern struct fib6_node         *fib6_lookup(struct fib6_node *root,
 277                                              const struct in6_addr *daddr,
 278                                              const struct in6_addr *saddr);
 279
 280 struct fib6_node                *fib6_locate(struct fib6_node *root,
 281                                              const struct in6_addr *daddr, int dst_len,
 282                                              const struct in6_addr *saddr, int src_len);
 283
 284 extern void                     fib6_clean_all_ro(struct net *net,
 285                                                int (*func)(struct rt6_info *, void *arg),
 286                                                int prune, void *arg);
 287
 288 extern void                     fib6_clean_all(struct net *net,
 289                                                int (*func)(struct rt6_info *, void *arg),
 290                                                int prune, void *arg);
 291
 292 extern int                      fib6_add(struct fib6_node *root,
 293                                          struct rt6_info *rt,
 294                                          struct nl_info *info);
 295
 296 extern int                      fib6_del(struct rt6_info *rt,
 297                                          struct nl_info *info);
 298
 299 extern void                     inet6_rt_notify(int event, struct rt6_info *rt,
 300                                                 struct nl_info *info);
 301
 302 extern void                     fib6_run_gc(unsigned long expires,
 303                                             struct net *net);
 304
 305 extern void                     fib6_gc_cleanup(void);
 306
 307 extern int                      fib6_init(void);
 308
 309 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 310 extern int                      fib6_rules_init(void);
 311 extern void                     fib6_rules_cleanup(void);
 312 #else
 313 static inline int               fib6_rules_init(void)
 314 {
 315         return 0;
 316 }
 317 static inline void              fib6_rules_cleanup(void)
 318 {
 319         return ;
 320 }
 321 #endif
 322 #endif